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[2/4] spi: omap2-mcspi: Fix set_cs function for active high

Message ID 1432433625-23407-3-git-send-email-mwelling@ieee.org (mailing list archive)
State Accepted
Commit 4373f8b6dab0de16e5ecf527626d958d20a45b3b
Headers show

Commit Message

Michael Welling May 24, 2015, 2:13 a.m. UTC 
The core spi driver swaps the polarity of the enable based on SPI_CS_HIGH.
The omap2 controller has an internal configuration register bit called
OMAP2_MCSPI_CHCONF_EPOL to handle active high chip selects as well.

So we have to revert swap the polarity back for the correct setting of the
OMAP2_MCSPI_CHCONF_FORCE bit in omap2_mcspi_set_cs.

Signed-off-by: Michael Welling <mwelling@ieee.org>
---
 drivers/spi/spi-omap2-mcspi.c |    7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 304b427..502db29 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -247,6 +247,13 @@  static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable)
 {
 	u32 l;
 
+	/* The controller handles the inverted chip selects
+	 * using the OMAP2_MCSPI_CHCONF_EPOL bit so revert
+	 * the inversion from the core spi_set_cs function.
+	 */
+	if (spi->mode & SPI_CS_HIGH)
+		enable = !enable;
+
 	if (spi->controller_state) {
 		l = mcspi_cached_chconf0(spi);